Postgres Adapter generates invalid quoted table names

Rails3 6c59e5a (but has been happening for a couple weeks, since around the time of the arel merge.)
(PostgreSQL) 8.4.1 pg gem 0.8.0

Gives me the error:

ActiveRecord::StatementInvalid in 'GET /escalation_defintions ssj with authorization before(:all)'
PGError: ERROR:  relation "escalation_definitions" does not exist
LINE 4:              WHERE a.attrelid = '"escalation_definitions"'::...
                                        ^
:             SELECT a.attname, format_type(a.atttypid, a.atttypmod), d.adsrc, a.attnotnull
              FROM pg_attribute a LEFT JOIN pg_attrdef d
                ON a.attrelid = d.adrelid AND a.attnum = d.adnum
             WHERE a.attrelid = '"escalation_definitions"'::regclass
               AND a.attnum > 0 AND NOT a.attisdropped
             ORDER BY a.attnum

/home/rando/development/api/alarm/vendor/gems/dirs/rails/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb:211:in `log'
/home/rando/development/api/alarm/vendor/gems/dirs/rails/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb:539:in `query'
/home/rando/development/api/alarm/vendor/gems/dirs/rails/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb:1094:in `column_definitions'
/home/rando/development/api/alarm/vendor/gems/dirs/rails/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb:707:in `columns'
/home/rando/development/api/alarm/vendor/gems/dirs/rails/activerecord/lib/active_record/base.rb:1318:in `columns'
/home/rando/development/api/alarm/vendor/gems/dirs/rails/activerecord/lib/active_record/base.rb:2967:in `attributes_from_column_definition_without_lock'
/home/rando/development/api/alarm/vendor/gems/dirs/rails/activerecord/lib/active_record/locking/optimistic.rb:66:in `attributes_from_column_definition'
/home/rando/development/api/alarm/vendor/gems/dirs/rails/activerecord/lib/active_record/base.rb:2396:in `initialize'
/home/rando/development/api/alarm/vendor/gems/gems/machinist-1.0.5/lib/machinist/active_record.rb:53:in `new'
/home/rando/development/api/alarm/vendor/gems/gems/machinist-1.0.5/lib/machinist/active_record.rb:53:in `make'
./spec/services/escalation_definition_ssj_spec.rb:7:
/home/rando/development/api/alarm/vendor/gems/dirs/rspec/lib/spec/example/example_methods.rb:70:in `instance_eval'
/home/rando/development/api/alarm/vendor/gems/dirs/rspec/lib/spec/example/example_methods.rb:70:in `eval_each_fail_fast'
/home/rando/development/api/alarm/vendor/gems/dirs/rspec/lib/spec/example/example_methods.rb:70:in `each'
/home/rando/development/api/alarm/vendor/gems/dirs/rspec/lib/spec/example/example_methods.rb:70:in `eval_each_fail_fast'
/home/rando/development/api/alarm/vendor/gems/dirs/rspec/lib/spec/example/example_group_hierarchy.rb:13:in `run_before_all'
/home/rando/development/api/alarm/vendor/gems/dirs/rspec/lib/spec/example/example_group_methods.rb:199:in `run_before_all'
/home/rando/development/api/alarm/vendor/gems/dirs/rspec/lib/spec/example/example_group_methods.rb:102:in `run'
/home/rando/development/api/alarm/vendor/gems/dirs/rspec/lib/spec/runner/example_group_runner.rb:23:in `run'
/home/rando/development/api/alarm/vendor/gems/dirs/rspec/lib/spec/runner/example_group_runner.rb:22:in `each'
/home/rando/development/api/alarm/vendor/gems/dirs/rspec/lib/spec/runner/example_group_runner.rb:22:in `run'
/home/rando/development/api/alarm/vendor/gems/dirs/rspec/lib/spec/runner/options.rb:151:in `run_examples'
/home/rando/development/api/alarm/vendor/gems/dirs/rspec/lib/spec/runner/command_line.rb:9:in `run'

It works OK on rev cbb70c896cc97077f851c1410a9fee98ca707a36, which is the latest I've tested. Significant changes to the structure of rails apps prevent me from bisecting to find the exact issue.